Arg, crappy cell service keeps eating my posts. Anyways: I'm glad to see my tactica is prompting some thinking and activity!
An unfortunate hang-up: daemons can't join CSM units and vise-versa, so no Huron in Daemonettes or Tzheralds in Havocs*. Just like they can't join daemons from other gods--a jealous lot, they are. So: you need some Horrors (say, 11, not 10, for the extra warp charge) for those Tzheralds to camp in. And I would consider dropping Huron entirely: sure, infiltrating the Noise Marines and Daemonettes would be nice, but you could, say, use his points to get those Horrors and a Herald of Slaanesh on a Steed of Slaanesh who is outflanking the Daemonettes. And who has a Greater Etherblade for the nasty statline. Then t1 you could Invisibility the Havocs for their survivability.
I'd consider using any points remaining/possibly dropping a few cultists to get another biker or two, since currently that IoE costs about 6.5 points per model for that FNP. Spread the cost out a bit, maybe. If not more bikers, another mastery level or two on the Heralds.
*Something I should almost certainly mention in my tactica, seeing as I think I glossed over that.
What sphinx of plascrete and adamantium bashed open their skulls and ate up their brains and imagination? Imperator! Imperator!